Simple SCO container wrappers need to add hooks for managed relations

When a user performs an operation like
setField.add(elem)
and the relation is bidirectional, we are relying on the user setting the other side of the relation. If they don't do this then "managed relations" should kick in and fix things for them. Need to add the necessary hooks to the simple SCO wrappers

Description

When a user performs an operation like
setField.add(elem)
and the relation is bidirectional, we are relying on the user setting the other side of the relation. If they don't do this then "managed relations" should kick in and fix things for them. Need to add the necessary hooks to the simple SCO wrappers